Daphne

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* Major rewrite to the new async-based ASGI specification and to support
Channels 2. Not backwards compatible.

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* Ability to set the websocket connection timeout

* Server no longer reveals the exact Autobahn version number for security

* A few unicode fixes for Python 2/3 compatability

* Stopped logging messages to already-closed connections as ERROR

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* The new process-specific channel support is now implemented, resulting in
significantly less traffic to your channel backend.

* Native twisted blocking support for channel layers that support it is now
used. While it is a lot more efficient, it is also sometimes slightly more
latent; you can disable it using --force-sync.

* Native SSL termination is now correctly reflected in the ASGI-HTTP `scheme`
key.

* accept: False is now a valid way to deny a connection, as well as close: True.

* HTTP version is now correctly sent as one of "1.0", "1.1" or "2".

* More command line options for websocket timeouts

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* HTTP/2 termination is now supported natively. The Twisted dependency has been
increased to at least 17.1 as a result; for more information about setting up
HTTP/2, see the README.

* X-Forwarded-For decoding support understands IPv6 addresses, and picks the
most remote (leftmost) entry if there are multiple relay hosts.

* Fixed an error where `disconnect` messages would still try and get sent even
if the client never finished a request.

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* IPv6 addresses are correctly accepted as bind targets on the command line

* Twisted 17.1 compatability fixes for WebSocket receiving/keepalive and
proxy header detection.

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* The "null" WebSocket origin (including file:// and no value) is now accepted
by Daphne and passed onto the application to accept/deny.

* Listening on file descriptors works properly again.

* The DeprecationError caused by not passing endpoints into a Server class
directly is now a warning instead.